or woo hoo or whoo-hoo
(used to express excitement, delight, etc.): Woo-hoo! It's Friday!
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for woo-hoo
And she had no idea that the way she acted on television—occasionally shouting out her signature rallying cry “Woo-hoo!”